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Covid-19 2021 November
Vaccines for Covid-19 part 5

Covid-19 vaccine effectiveness falls a lot in 6 months      web

webhttps://www.latimes.com/science/story/2021-11-04/study-shows-dramatic-decline-in-effectiveness-of-covid-19-vaccines
authorMelissa Healy
publicationLos Angeles Times
date2021-11-04

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